blobtool: Don't pad created tar archives to a multiple of 10240 bytes
blobtool: Don't pad created tar archives to a multiple of 10240 bytes

- By default, libarchive pads output tar files to a multiple of 10240
bytes (*after* compression) for proper blocking on tape drives.  We
don't need this; disable it.

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr